Years ago I ran into the same dropout issue when switching partconv~ IR that could not be solved by multiplexing with smooth overlap. Back then I had a look into the C code and (off the top of my head) my conclusion was that it might be a CPU spike related to the underlying FFTW library making a new "plan" for optimal FFT calculation every time when partconv~ switches filter definition (even when filter length remains unaltered). If that is true, not easy to fix.
Katja On 5/3/21, Gloria Dal Santo <[email protected]> wrote: > Hi everyone, > > After playing with partconv~ in other to implement a patch for sound > externalization I am asking myself whether what I am trying to do is maybe > too much for pure data or not. > > To sum up, I need to convolve a sound file with a BRIR that is updated > whenever the listener moves his head, so that to simulate a fixed sound > source. > I already have a dataset of 36 impulse responses, each of size 8192 > samples. > > [partconv~] allows to change the impulse response by sending a [set ir_name( > message. (For [convolve~] the message would be [set ir_name( ). > Unfortunately, as soon as I send the [set _ ( message the audio stopes for a > little while. Why is it so? I tried to dig into the code and I guess is > simply because the buffers are freed when the set method is called. > > I tried to define larger buffers so that I can store multiple BRIRs and have > access to them without freeing the buffers (even though extra care must be > taken in the perform method) but I think I don’t have enough coding skills > to do that. > > I then tried to use 5 [partconv~]s for each channel (thus 10 [partconv~]s) > running at the same time with different BRIRs and multiplexing between > them. > The idea is that of switching between the outputs of the [partconv~] that > are not updating their BRIRs, while one of the [partconv~] is actually > updating it according to the direction of the head. > To achieve this I’m using the [mux~] object. > The idea seems working, but it actually doesn’t. When I switch between > [mux~] inputs sometimes I get clicks. On the spectrogram these look like > vertical lines of constant values (like noise). > What could be the reason? Do you think that having 10 [partconv~] running > at the same time is too much? > > Thank you in advance for your time, > With my best regard, > > Gloria > > _______________________________________________ Pd-dev mailing list [email protected] https://lists.puredata.info/listinfo/pd-dev
